#include <iostream>
#include <set>
#include <array>

using namespace std;

int main()
{
	size_t n = 3;
	set<array<int, 2>> s;
	s.insert({1, 2
});
	for (auto& arr : s)
	{
		cout << arr[0] << "," << arr[1] << endl;
	}

	return 0;
}